I don't think mortgage capital restructuring is a particularly useful option - should you choose to rent out house 1, the only tax deductible mortgage interest is on the mortgage used to acquire the property, on which I gather there's an outstanding balance of €180,000.
KalEl's right - you have two main options:
(1) You could drop the price - say by €19,000 (the amount of the clawback you would have to pay if renting) - and see if that's enough to make it sell. Providing you sell by next December without renting it out in the intervening period you won't incur a CGT liability - although realistically, you appear to need to get a sale in a shorter time.
(2) You become a landlord. If you were to convert the mortgage to interest only, it looks like your interest payments would be somewhere around or under €750 per month, giving you a gross rental profit of €450 if you can indeed secure €1,200 in rent (not taking into account vacancy periods and other deductibles). Certain other expenses and depreciation may also be allowable against rental profit. Rental profit will be taxable at your marginal rate of tax.
However, this is not something that should be done lightly. First of all, you wil have to find your €19,000 from somewhere because the clawback is due immediately. You'll also have to fund any furniture / fittings / decoration needed prior to renting; to register any tenancy with the PRTB; to be prepared to pay a management company to find and vet tenants and possibly arrange repairs, etc., or undertake the work yourself; to make tax returns in relation to rental income - all the various legal and financial responsibilities that being a landlord entails. And you will then have a CGT liability in relation to the ultimate disposal of the property, whenever that is.
If you're under financial pressure I'd honestly be inclined to drop the price to secure the sale, if your EA reckons that's enough to do it. Either way, you need to be aware of the up-front expenses and the implications of being a landlord. Too many "accidental landlords" assume that everything will just take care of itself - and while, with good tenants and a well maintained property, it may nearly do so, you can't afford to assume that.